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Revision History for A251022

(Underlined text is an addition; strikethrough text is a deletion.)

Showing all changes.
A251022 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements greater than the maximum of its antidiagonal elements
(history; published version)
#6 by R. H. Hardin at Mon Dec 01 12:49:09 EST 2014
STATUS

editing

approved

#5 by R. H. Hardin at Mon Dec 01 12:49:06 EST 2014
NAME

Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements smallergreater than the maximum of its antidiagonal elements

STATUS

approved

editing

#4 by R. H. Hardin at Sat Nov 29 17:00:20 EST 2014
STATUS

editing

approved

#3 by R. H. Hardin at Sat Nov 29 17:00:17 EST 2014
LINKS

R. H. Hardin, <a href="/A251022/b251022.txt">Table of n, a(n) for n = 1..210</a>

#2 by R. H. Hardin at Sat Nov 29 17:00:02 EST 2014
NAME

allocated for R. H. Hardin

Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements smaller than the maximum of its antidiagonal elements

DATA

526, 2546, 8207, 23404, 60044, 144737, 334167, 755336, 1690491, 3781186, 8485355, 19144607, 43420578, 98930808, 226191116, 518462850, 1190424308, 2736380757, 6294485365, 14485586642, 33344734931, 76769227278, 176761167633

OFFSET

1,1

COMMENTS

Column 2 of A251028

FORMULA

Empirical: a(n) = 8*a(n-1) -25*a(n-2) +35*a(n-3) -7*a(n-4) -49*a(n-5) +77*a(n-6) -55*a(n-7) +20*a(n-8) -3*a(n-9) for n>13

EXAMPLE

Some solutions for n=4

..0..1..3....0..2..3....0..0..2....0..1..2....0..0..3....1..0..2....1..1..3

..0..0..2....0..0..1....0..0..0....1..1..1....3..3..3....1..0..2....1..0..0

..1..1..1....1..1..1....0..0..0....1..0..0....0..0..0....2..0..2....1..0..0

..0..0..0....0..0..0....1..1..0....2..1..1....2..2..2....2..0..0....1..0..0

..3..0..0....3..3..0....3..1..0....3..1..0....1..0..0....3..0..0....1..0..0

KEYWORD

allocated

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

editing

#1 by R. H. Hardin at Sat Nov 29 16:48:07 EST 2014
NAME

allocated for R. H. Hardin

KEYWORD

allocated

STATUS

approved

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Last modified August 18 22:11 EDT 2024. Contains 375284 sequences. (Running on oeis4.)